http://llvm.org/bugs/show_bug.cgi?id=9399 fixed by Ryuta Suzuki

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@131961 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/config-ix.cmake

@@ -25,6 +25,7 @@ check_cxx_compiler_flag(/GR-                  LIBCXX_HAS_NO_GR_FLAG)
 check_library_exists(pthread pthread_create "" LIBCXX_HAS_PTHREAD_LIB)
 check_library_exists(c printf "" LIBCXX_HAS_C_LIB)
 check_library_exists(m ccos "" LIBCXX_HAS_M_LIB)
+check_library_exists(rt clock_gettime "" LIBCXX_HAS_RT_LIB)
 check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXX_HAS_GCC_S_LIB)
 
 # Check C++0x features

lib/CMakeLists.txt

@@ -27,6 +27,7 @@ endif()
 append_if(libraries LIBCXX_HAS_PTHREAD_LIB pthread)
 append_if(libraries LIBCXX_HAS_C_LIB c)
 append_if(libraries LIBCXX_HAS_M_LIB m)
+append_if(libraries LIBCXX_HAS_RT_LIB rt)
 append_if(libraries LIBCXX_HAS_GCC_S_LIB gcc_s)
 
 target_link_libraries(cxx ${libraries})